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5c2c6c95 ILT |
1 | // dwarf_reader.cc -- parse dwarf2/3 debug information |
2 | ||
3 | // Copyright 2007 Free Software Foundation, Inc. | |
4 | // Written by Ian Lance Taylor <iant@google.com>. | |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
23 | #include "gold.h" | |
24 | ||
25 | #include "elfcpp_swap.h" | |
26 | #include "dwarf.h" | |
24badc65 | 27 | #include "object.h" |
4c50553d | 28 | #include "reloc.h" |
5c2c6c95 ILT |
29 | #include "dwarf_reader.h" |
30 | ||
31 | namespace { | |
32 | ||
33 | // Read an unsigned LEB128 number. Each byte contains 7 bits of | |
34 | // information, plus one bit saying whether the number continues or | |
35 | // not. | |
36 | ||
37 | uint64_t | |
38 | read_unsigned_LEB_128(const unsigned char* buffer, size_t* len) | |
39 | { | |
40 | uint64_t result = 0; | |
41 | size_t num_read = 0; | |
42 | unsigned int shift = 0; | |
43 | unsigned char byte; | |
44 | ||
45 | do | |
46 | { | |
47 | byte = *buffer++; | |
48 | num_read++; | |
49 | result |= (static_cast<uint64_t>(byte & 0x7f)) << shift; | |
50 | shift += 7; | |
51 | } | |
52 | while (byte & 0x80); | |
53 | ||
54 | *len = num_read; | |
55 | ||
56 | return result; | |
57 | } | |
58 | ||
59 | // Read a signed LEB128 number. These are like regular LEB128 | |
60 | // numbers, except the last byte may have a sign bit set. | |
61 | ||
62 | int64_t | |
63 | read_signed_LEB_128(const unsigned char* buffer, size_t* len) | |
64 | { | |
65 | int64_t result = 0; | |
66 | int shift = 0; | |
67 | size_t num_read = 0; | |
68 | unsigned char byte; | |
69 | ||
70 | do | |
71 | { | |
72 | byte = *buffer++; | |
73 | num_read++; | |
74 | result |= (static_cast<uint64_t>(byte & 0x7f) << shift); | |
75 | shift += 7; | |
76 | } | |
77 | while (byte & 0x80); | |
78 | ||
79 | if ((shift < 8 * static_cast<int>(sizeof(result))) && (byte & 0x40)) | |
80 | result |= -((static_cast<int64_t>(1)) << shift); | |
81 | *len = num_read; | |
82 | return result; | |
83 | } | |
84 | ||
85 | } // End anonymous namespace. | |
86 | ||
87 | ||
88 | namespace gold { | |
89 | ||
90 | // This is the format of a DWARF2/3 line state machine that we process | |
91 | // opcodes using. There is no need for anything outside the lineinfo | |
92 | // processor to know how this works. | |
93 | ||
94 | struct LineStateMachine | |
95 | { | |
96 | int file_num; | |
97 | uint64_t address; | |
98 | int line_num; | |
99 | int column_num; | |
100 | unsigned int shndx; // the section address refers to | |
101 | bool is_stmt; // stmt means statement. | |
102 | bool basic_block; | |
103 | bool end_sequence; | |
104 | }; | |
105 | ||
106 | static void | |
107 | ResetLineStateMachine(struct LineStateMachine* lsm, bool default_is_stmt) | |
108 | { | |
109 | lsm->file_num = 1; | |
110 | lsm->address = 0; | |
111 | lsm->line_num = 1; | |
112 | lsm->column_num = 0; | |
338f2eba | 113 | lsm->shndx = -1U; |
5c2c6c95 ILT |
114 | lsm->is_stmt = default_is_stmt; |
115 | lsm->basic_block = false; | |
116 | lsm->end_sequence = false; | |
117 | } | |
118 | ||
24badc65 ILT |
119 | template<int size, bool big_endian> |
120 | Dwarf_line_info<size, big_endian>::Dwarf_line_info( | |
121 | Sized_relobj<size, big_endian>* object) | |
122 | : data_valid_(true), buffer_(NULL), symtab_buffer_(NULL), | |
123 | directories_(1), files_(1) | |
124 | { | |
125 | unsigned int debug_shndx; | |
126 | for (debug_shndx = 0; debug_shndx < object->shnum(); ++debug_shndx) | |
127 | if (object->section_name(debug_shndx) == ".debug_line") | |
128 | { | |
129 | off_t buffer_size; | |
130 | this->buffer_ = object->section_contents( | |
131 | debug_shndx, &buffer_size, false); | |
132 | this->buffer_end_ = this->buffer_ + buffer_size; | |
133 | break; | |
134 | } | |
135 | if (this->buffer_ == NULL) | |
136 | { | |
137 | this->data_valid_ = false; | |
138 | return; | |
139 | } | |
140 | ||
141 | // Find the relocation section for ".debug_line". | |
142 | bool got_relocs = false; | |
143 | for (unsigned int reloc_shndx = 0; | |
144 | reloc_shndx < object->shnum(); | |
145 | ++reloc_shndx) | |
146 | { | |
147 | unsigned int reloc_sh_type = object->section_type(reloc_shndx); | |
148 | if ((reloc_sh_type == elfcpp::SHT_REL | |
149 | || reloc_sh_type == elfcpp::SHT_RELA) | |
150 | && object->section_info(reloc_shndx) == debug_shndx) | |
151 | { | |
152 | got_relocs = this->track_relocs_.initialize(object, reloc_shndx, | |
153 | reloc_sh_type); | |
154 | break; | |
155 | } | |
156 | } | |
157 | if (!got_relocs) | |
158 | { | |
159 | this->data_valid_ = false; | |
160 | return; | |
161 | } | |
162 | ||
163 | // Finally, we need the symtab section to interpret the relocs. | |
164 | unsigned int symtab_shndx; | |
165 | for (symtab_shndx = 0; symtab_shndx < object->shnum(); ++symtab_shndx) | |
166 | if (object->section_type(symtab_shndx) == elfcpp::SHT_SYMTAB) | |
167 | { | |
168 | off_t symtab_size; | |
169 | this->symtab_buffer_ = object->section_contents( | |
170 | symtab_shndx, &symtab_size, false); | |
171 | this->symtab_buffer_end_ = this->symtab_buffer_ + symtab_size; | |
172 | break; | |
173 | } | |
174 | if (this->symtab_buffer_ == NULL) | |
175 | { | |
176 | this->data_valid_ = false; | |
177 | return; | |
178 | } | |
179 | ||
180 | // Now that we have successfully read all the data, parse the debug | |
181 | // info. | |
182 | this->read_line_mappings(); | |
183 | } | |
184 | ||
5c2c6c95 ILT |
185 | // Read the DWARF header. |
186 | ||
187 | template<int size, bool big_endian> | |
188 | const unsigned char* | |
e43872e9 ILT |
189 | Dwarf_line_info<size, big_endian>::read_header_prolog( |
190 | const unsigned char* lineptr) | |
5c2c6c95 ILT |
191 | { |
192 | uint32_t initial_length = elfcpp::Swap<32, big_endian>::readval(lineptr); | |
193 | lineptr += 4; | |
194 | ||
195 | // In DWARF2/3, if the initial length is all 1 bits, then the offset | |
196 | // size is 8 and we need to read the next 8 bytes for the real length. | |
197 | if (initial_length == 0xffffffff) | |
198 | { | |
199 | header_.offset_size = 8; | |
200 | initial_length = elfcpp::Swap<64, big_endian>::readval(lineptr); | |
201 | lineptr += 8; | |
202 | } | |
203 | else | |
204 | header_.offset_size = 4; | |
205 | ||
206 | header_.total_length = initial_length; | |
207 | ||
208 | gold_assert(lineptr + header_.total_length <= buffer_end_); | |
209 | ||
210 | header_.version = elfcpp::Swap<16, big_endian>::readval(lineptr); | |
211 | lineptr += 2; | |
212 | ||
213 | if (header_.offset_size == 4) | |
214 | header_.prologue_length = elfcpp::Swap<32, big_endian>::readval(lineptr); | |
215 | else | |
216 | header_.prologue_length = elfcpp::Swap<64, big_endian>::readval(lineptr); | |
217 | lineptr += header_.offset_size; | |
218 | ||
219 | header_.min_insn_length = *lineptr; | |
220 | lineptr += 1; | |
221 | ||
222 | header_.default_is_stmt = *lineptr; | |
223 | lineptr += 1; | |
224 | ||
225 | header_.line_base = *reinterpret_cast<const signed char*>(lineptr); | |
226 | lineptr += 1; | |
227 | ||
228 | header_.line_range = *lineptr; | |
229 | lineptr += 1; | |
230 | ||
231 | header_.opcode_base = *lineptr; | |
232 | lineptr += 1; | |
233 | ||
234 | header_.std_opcode_lengths.reserve(header_.opcode_base + 1); | |
235 | header_.std_opcode_lengths[0] = 0; | |
236 | for (int i = 1; i < header_.opcode_base; i++) | |
237 | { | |
238 | header_.std_opcode_lengths[i] = *lineptr; | |
239 | lineptr += 1; | |
240 | } | |
241 | ||
242 | return lineptr; | |
243 | } | |
244 | ||
245 | // The header for a debug_line section is mildly complicated, because | |
246 | // the line info is very tightly encoded. | |
247 | ||
e43872e9 | 248 | template<int size, bool big_endian> |
5c2c6c95 | 249 | const unsigned char* |
e43872e9 ILT |
250 | Dwarf_line_info<size, big_endian>::read_header_tables( |
251 | const unsigned char* lineptr) | |
5c2c6c95 ILT |
252 | { |
253 | // It is legal for the directory entry table to be empty. | |
254 | if (*lineptr) | |
255 | { | |
256 | int dirindex = 1; | |
257 | while (*lineptr) | |
258 | { | |
259 | const unsigned char* dirname = lineptr; | |
260 | gold_assert(dirindex == static_cast<int>(directories_.size())); | |
261 | directories_.push_back(reinterpret_cast<const char*>(dirname)); | |
262 | lineptr += directories_.back().size() + 1; | |
263 | dirindex++; | |
264 | } | |
265 | } | |
266 | lineptr++; | |
267 | ||
268 | // It is also legal for the file entry table to be empty. | |
269 | if (*lineptr) | |
270 | { | |
271 | int fileindex = 1; | |
272 | size_t len; | |
273 | while (*lineptr) | |
274 | { | |
275 | const char* filename = reinterpret_cast<const char*>(lineptr); | |
276 | lineptr += strlen(filename) + 1; | |
277 | ||
278 | uint64_t dirindex = read_unsigned_LEB_128(lineptr, &len); | |
279 | if (dirindex >= directories_.size()) | |
280 | dirindex = 0; | |
281 | lineptr += len; | |
282 | ||
283 | read_unsigned_LEB_128(lineptr, &len); // mod_time | |
284 | lineptr += len; | |
285 | ||
286 | read_unsigned_LEB_128(lineptr, &len); // filelength | |
287 | lineptr += len; | |
288 | ||
289 | gold_assert(fileindex == static_cast<int>(files_.size())); | |
290 | files_.push_back(std::pair<int, std::string>(dirindex, filename)); | |
291 | fileindex++; | |
292 | } | |
293 | } | |
294 | lineptr++; | |
295 | ||
296 | return lineptr; | |
297 | } | |
298 | ||
299 | // Process a single opcode in the .debug.line structure. | |
300 | ||
301 | // Templating on size and big_endian would yield more efficient (and | |
302 | // simpler) code, but would bloat the binary. Speed isn't important | |
303 | // here. | |
304 | ||
e43872e9 | 305 | template<int size, bool big_endian> |
5c2c6c95 | 306 | bool |
e43872e9 ILT |
307 | Dwarf_line_info<size, big_endian>::process_one_opcode( |
308 | const unsigned char* start, struct LineStateMachine* lsm, size_t* len) | |
5c2c6c95 ILT |
309 | { |
310 | size_t oplen = 0; | |
311 | size_t templen; | |
312 | unsigned char opcode = *start; | |
313 | oplen++; | |
314 | start++; | |
315 | ||
316 | // If the opcode is great than the opcode_base, it is a special | |
317 | // opcode. Most line programs consist mainly of special opcodes. | |
318 | if (opcode >= header_.opcode_base) | |
319 | { | |
320 | opcode -= header_.opcode_base; | |
321 | const int advance_address = ((opcode / header_.line_range) | |
322 | * header_.min_insn_length); | |
323 | lsm->address += advance_address; | |
324 | ||
325 | const int advance_line = ((opcode % header_.line_range) | |
326 | + header_.line_base); | |
327 | lsm->line_num += advance_line; | |
328 | lsm->basic_block = true; | |
329 | *len = oplen; | |
330 | return true; | |
331 | } | |
332 | ||
333 | // Otherwise, we have the regular opcodes | |
334 | switch (opcode) | |
335 | { | |
336 | case elfcpp::DW_LNS_copy: | |
337 | lsm->basic_block = false; | |
338 | *len = oplen; | |
339 | return true; | |
340 | ||
341 | case elfcpp::DW_LNS_advance_pc: | |
342 | { | |
343 | const uint64_t advance_address | |
344 | = read_unsigned_LEB_128(start, &templen); | |
345 | oplen += templen; | |
346 | lsm->address += header_.min_insn_length * advance_address; | |
347 | } | |
348 | break; | |
349 | ||
350 | case elfcpp::DW_LNS_advance_line: | |
351 | { | |
352 | const uint64_t advance_line = read_signed_LEB_128(start, &templen); | |
353 | oplen += templen; | |
354 | lsm->line_num += advance_line; | |
355 | } | |
356 | break; | |
357 | ||
358 | case elfcpp::DW_LNS_set_file: | |
359 | { | |
360 | const uint64_t fileno = read_unsigned_LEB_128(start, &templen); | |
361 | oplen += templen; | |
362 | lsm->file_num = fileno; | |
363 | } | |
364 | break; | |
365 | ||
366 | case elfcpp::DW_LNS_set_column: | |
367 | { | |
368 | const uint64_t colno = read_unsigned_LEB_128(start, &templen); | |
369 | oplen += templen; | |
370 | lsm->column_num = colno; | |
371 | } | |
372 | break; | |
373 | ||
374 | case elfcpp::DW_LNS_negate_stmt: | |
375 | lsm->is_stmt = !lsm->is_stmt; | |
376 | break; | |
377 | ||
378 | case elfcpp::DW_LNS_set_basic_block: | |
379 | lsm->basic_block = true; | |
380 | break; | |
381 | ||
382 | case elfcpp::DW_LNS_fixed_advance_pc: | |
383 | { | |
384 | int advance_address; | |
e43872e9 | 385 | advance_address = elfcpp::Swap<16, big_endian>::readval(start); |
5c2c6c95 ILT |
386 | oplen += 2; |
387 | lsm->address += advance_address; | |
388 | } | |
389 | break; | |
390 | ||
391 | case elfcpp::DW_LNS_const_add_pc: | |
392 | { | |
393 | const int advance_address = (header_.min_insn_length | |
394 | * ((255 - header_.opcode_base) | |
395 | / header_.line_range)); | |
396 | lsm->address += advance_address; | |
397 | } | |
398 | break; | |
399 | ||
400 | case elfcpp::DW_LNS_extended_op: | |
401 | { | |
402 | const uint64_t extended_op_len | |
403 | = read_unsigned_LEB_128(start, &templen); | |
404 | start += templen; | |
405 | oplen += templen + extended_op_len; | |
406 | ||
407 | const unsigned char extended_op = *start; | |
408 | start++; | |
409 | ||
410 | switch (extended_op) | |
411 | { | |
412 | case elfcpp::DW_LNE_end_sequence: | |
413 | lsm->end_sequence = true; | |
414 | *len = oplen; | |
415 | return true; | |
416 | ||
417 | case elfcpp::DW_LNE_set_address: | |
4c50553d ILT |
418 | { |
419 | typename Reloc_map::const_iterator it | |
420 | = reloc_map_.find(start - this->buffer_); | |
421 | if (it != reloc_map_.end()) | |
422 | { | |
423 | // value + addend. | |
424 | lsm->address = | |
425 | (elfcpp::Swap<size, big_endian>::readval(start) | |
426 | + it->second.second); | |
427 | lsm->shndx = it->second.first; | |
428 | } | |
429 | else | |
430 | { | |
431 | // Every set_address should have an associated | |
432 | // relocation. | |
433 | this->data_valid_ = false; | |
434 | } | |
435 | break; | |
24badc65 | 436 | } |
5c2c6c95 ILT |
437 | case elfcpp::DW_LNE_define_file: |
438 | { | |
439 | const char* filename = reinterpret_cast<const char*>(start); | |
440 | templen = strlen(filename) + 1; | |
441 | start += templen; | |
442 | ||
443 | uint64_t dirindex = read_unsigned_LEB_128(start, &templen); | |
444 | if (dirindex >= directories_.size()) | |
445 | dirindex = 0; | |
446 | oplen += templen; | |
447 | ||
448 | read_unsigned_LEB_128(start, &templen); // mod_time | |
449 | oplen += templen; | |
450 | ||
451 | read_unsigned_LEB_128(start, &templen); // filelength | |
452 | oplen += templen; | |
453 | ||
454 | files_.push_back(std::pair<int, std::string>(dirindex, | |
455 | filename)); | |
456 | } | |
457 | break; | |
458 | } | |
459 | } | |
460 | break; | |
461 | ||
462 | default: | |
463 | { | |
464 | // Ignore unknown opcode silently | |
465 | for (int i = 0; i < header_.std_opcode_lengths[opcode]; i++) | |
466 | { | |
467 | size_t templen; | |
468 | read_unsigned_LEB_128(start, &templen); | |
469 | start += templen; | |
470 | oplen += templen; | |
471 | } | |
472 | } | |
473 | break; | |
474 | } | |
475 | *len = oplen; | |
476 | return false; | |
477 | } | |
478 | ||
479 | // Read the debug information at LINEPTR and store it in the line | |
480 | // number map. | |
481 | ||
e43872e9 | 482 | template<int size, bool big_endian> |
5c2c6c95 | 483 | unsigned const char* |
e43872e9 | 484 | Dwarf_line_info<size, big_endian>::read_lines(unsigned const char* lineptr) |
5c2c6c95 ILT |
485 | { |
486 | struct LineStateMachine lsm; | |
487 | ||
488 | // LENGTHSTART is the place the length field is based on. It is the | |
489 | // point in the header after the initial length field. | |
490 | const unsigned char* lengthstart = buffer_; | |
491 | ||
492 | // In 64 bit dwarf, the initial length is 12 bytes, because of the | |
493 | // 0xffffffff at the start. | |
494 | if (header_.offset_size == 8) | |
495 | lengthstart += 12; | |
496 | else | |
497 | lengthstart += 4; | |
498 | ||
499 | while (lineptr < lengthstart + header_.total_length) | |
500 | { | |
501 | ResetLineStateMachine(&lsm, header_.default_is_stmt); | |
502 | while (!lsm.end_sequence) | |
503 | { | |
504 | size_t oplength; | |
e43872e9 | 505 | bool add_line = this->process_one_opcode(lineptr, &lsm, &oplength); |
5c2c6c95 ILT |
506 | if (add_line) |
507 | { | |
508 | Offset_to_lineno_entry entry | |
509 | = { lsm.address, lsm.file_num, lsm.line_num }; | |
510 | line_number_map_[lsm.shndx].push_back(entry); | |
511 | } | |
512 | lineptr += oplength; | |
513 | } | |
514 | } | |
515 | ||
516 | return lengthstart + header_.total_length; | |
517 | } | |
518 | ||
4c50553d ILT |
519 | // Looks in the symtab to see what section a symbol is in. |
520 | ||
521 | template<int size, bool big_endian> | |
522 | unsigned int | |
523 | Dwarf_line_info<size, big_endian>::symbol_section( | |
524 | unsigned int sym, | |
525 | typename elfcpp::Elf_types<size>::Elf_Addr* value) | |
526 | { | |
527 | const int symsize = elfcpp::Elf_sizes<size>::sym_size; | |
528 | gold_assert(this->symtab_buffer_ + sym * symsize < this->symtab_buffer_end_); | |
529 | elfcpp::Sym<size, big_endian> elfsym(this->symtab_buffer_ + sym * symsize); | |
530 | *value = elfsym.get_st_value(); | |
531 | return elfsym.get_st_shndx(); | |
532 | } | |
533 | ||
534 | // Read the relocations into a Reloc_map. | |
535 | ||
536 | template<int size, bool big_endian> | |
537 | void | |
538 | Dwarf_line_info<size, big_endian>::read_relocs() | |
539 | { | |
540 | if (this->symtab_buffer_ == NULL) | |
541 | return; | |
542 | ||
543 | typename elfcpp::Elf_types<size>::Elf_Addr value; | |
544 | off_t reloc_offset; | |
24badc65 | 545 | while ((reloc_offset = this->track_relocs_.next_offset()) != -1) |
4c50553d | 546 | { |
24badc65 | 547 | const unsigned int sym = this->track_relocs_.next_symndx(); |
4c50553d ILT |
548 | const unsigned int shndx = this->symbol_section(sym, &value); |
549 | this->reloc_map_[reloc_offset] = std::make_pair(shndx, value); | |
24badc65 | 550 | this->track_relocs_.advance(reloc_offset + 1); |
4c50553d ILT |
551 | } |
552 | } | |
553 | ||
554 | // Read the line number info. | |
555 | ||
e43872e9 | 556 | template<int size, bool big_endian> |
5c2c6c95 | 557 | void |
e43872e9 | 558 | Dwarf_line_info<size, big_endian>::read_line_mappings() |
5c2c6c95 | 559 | { |
24badc65 ILT |
560 | if (this->data_valid_ == false) |
561 | return; | |
562 | ||
4c50553d ILT |
563 | read_relocs(); |
564 | while (this->buffer_ < this->buffer_end_) | |
e43872e9 | 565 | { |
4c50553d | 566 | const unsigned char* lineptr = this->buffer_; |
e43872e9 ILT |
567 | lineptr = this->read_header_prolog(lineptr); |
568 | lineptr = this->read_header_tables(lineptr); | |
569 | lineptr = this->read_lines(lineptr); | |
4c50553d | 570 | this->buffer_ = lineptr; |
e43872e9 ILT |
571 | } |
572 | ||
573 | // Sort the lines numbers, so addr2line can use binary search. | |
574 | for (typename Lineno_map::iterator it = line_number_map_.begin(); | |
5c2c6c95 ILT |
575 | it != line_number_map_.end(); |
576 | ++it) | |
577 | // Each vector needs to be sorted by offset. | |
4c50553d | 578 | std::sort(it->second.begin(), it->second.end()); |
5c2c6c95 ILT |
579 | } |
580 | ||
581 | // Return a string for a file name and line number. | |
582 | ||
e43872e9 | 583 | template<int size, bool big_endian> |
5c2c6c95 | 584 | std::string |
e43872e9 | 585 | Dwarf_line_info<size, big_endian>::addr2line(unsigned int shndx, off_t offset) |
5c2c6c95 | 586 | { |
4c50553d ILT |
587 | if (this->data_valid_ == false) |
588 | return ""; | |
589 | ||
5c2c6c95 | 590 | const Offset_to_lineno_entry lookup_key = { offset, 0, 0 }; |
4c50553d ILT |
591 | std::vector<Offset_to_lineno_entry>& offsets = this->line_number_map_[shndx]; |
592 | if (offsets.empty()) | |
593 | return ""; | |
594 | ||
e43872e9 | 595 | typename std::vector<Offset_to_lineno_entry>::const_iterator it |
5c2c6c95 ILT |
596 | = std::lower_bound(offsets.begin(), offsets.end(), lookup_key); |
597 | ||
598 | // If we found an exact match, great, otherwise find the last entry | |
599 | // before the passed-in offset. | |
600 | if (it->offset > offset) | |
601 | { | |
602 | if (it == offsets.begin()) | |
603 | return ""; | |
604 | --it; | |
605 | gold_assert(it->offset < offset); | |
606 | } | |
607 | ||
608 | // Convert the file_num + line_num into a string. | |
609 | std::string ret; | |
610 | gold_assert(it->file_num < static_cast<int>(files_.size())); | |
611 | const std::pair<int, std::string>& filename_pair = files_[it->file_num]; | |
612 | gold_assert(filename_pair.first < static_cast<int>(directories_.size())); | |
613 | const std::string& dirname = directories_[filename_pair.first]; | |
614 | const std::string& filename = filename_pair.second; | |
615 | if (!dirname.empty()) | |
616 | { | |
617 | ret += dirname; | |
618 | ret += "/"; | |
619 | } | |
620 | ret += filename; | |
621 | if (ret.empty()) | |
622 | ret = "(unknown)"; | |
623 | ||
624 | char buffer[64]; // enough to hold a line number | |
625 | snprintf(buffer, sizeof(buffer), "%d", it->line_num); | |
626 | ret += ":"; | |
627 | ret += buffer; | |
628 | ||
629 | return ret; | |
630 | } | |
631 | ||
632 | #ifdef HAVE_TARGET_32_LITTLE | |
633 | template | |
e43872e9 | 634 | class Dwarf_line_info<32, false>; |
5c2c6c95 ILT |
635 | #endif |
636 | ||
637 | #ifdef HAVE_TARGET_32_BIG | |
638 | template | |
e43872e9 | 639 | class Dwarf_line_info<32, true>; |
5c2c6c95 ILT |
640 | #endif |
641 | ||
642 | #ifdef HAVE_TARGET_64_LITTLE | |
643 | template | |
e43872e9 | 644 | class Dwarf_line_info<64, false>; |
5c2c6c95 ILT |
645 | #endif |
646 | ||
647 | #ifdef HAVE_TARGET_64_BIG | |
648 | template | |
e43872e9 | 649 | class Dwarf_line_info<64, true>; |
5c2c6c95 ILT |
650 | #endif |
651 | ||
652 | } // End namespace gold. |